<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        class car{
            a = 1;
            mov = function(){
                console.log(this.a);
                console.log(111);
            }
        }

        let c1 = new car()
        c1.mov()
        console.log(c1);
    </script>
</body>
</html>